Re: [vcf-midatlantic] TRS-80 mystery item
Yep, it’s a CoCo floppy controller, probably an FD-500? Thanks for the assist! I actually have two CoCos, but I’ve never turned either on sadly (hence the “downsize” thread.) - Bob Shuster
Message: 1 Date: Sat, 16 Jul 2022 13:41:11 -0400 From: Bob Shuster <bob@theshusters.com> To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Subject: [vcf-midatlantic] TRS-80 mystery item Message-ID: <1C522DD1-30AA-41D0-9CD9-79904B09F1AB@theshusters.com> Content-Type: text/plain; charset=utf-8
I found a device among my TRS-80 stuff that I can?t identify. It?s some sort of floppy controller, but in a blank case. It?s got an FD1793B-02 chip socketed in it, and 40-pin and 34-pin card-edge connectors on each end. Solder side of the board has ?8709203 Rev. B? on it, but I can find no reference to this online anywhere.
Anyone have a clue? Photos here: https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp... <https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp=sharing>
Thanks. - Bob Shuster
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Message: 2 Date: Sat, 16 Jul 2022 17:45:06 +0000 From: Richard Cini <rich.cini@gmail.com> To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Bob Shuster <bob@theshusters.com> Subject: Re: [vcf-midatlantic] TRS-80 mystery item Message-ID: <SN4P221MB0730049A06FFE9B212F34BEFFB8A9@SN4P221MB0730.NAMP221.PROD.OUTLOOK.COM>
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To me it looks like a floppy controller from a CoCo.
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________________________________ From: vcf-midatlantic <vcf-midatlantic-bounces@lists.vcfed.org> on behalf of Bob Shuster via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Sent: Saturday, July 16, 2022 1:41:11 PM To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Bob Shuster <bob@theshusters.com> Subject: [vcf-midatlantic] TRS-80 mystery item
I found a device among my TRS-80 stuff that I can?t identify. It?s some sort of floppy controller, but in a blank case. It?s got an FD1793B-02 chip socketed in it, and 40-pin and 34-pin card-edge connectors on each end. Solder side of the board has ?8709203 Rev. B? on it, but I can find no reference to this online anywhere.
Anyone have a clue? Photos here: https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp... <https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp=sharing>
Thanks. - Bob Shuster
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Message: 3 Date: Sat, 16 Jul 2022 14:08:43 -0400 From: Dave Shevett <shevett@pobox.com> To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> Cc: Bob Shuster <bob@theshusters.com> Subject: Re: [vcf-midatlantic] TRS-80 mystery item Message-ID: <CAFUwuBp7niWz99Eumesn3p--XaszTTT7mgb_oVuvY9wcg93+zA@mail.gmail.com> Content-Type: text/plain; charset="UTF-8"
COCO interface, floppy disk controller. The main chip there is: Part, FD1793-02. Description, FLOPPY DISK FORMATTER/CONTROLlER.
The other chips are also floppy controller related. Found a reference to the WD1691V : "So I was surprised when I found an IC chip in the middle of an otherwise functional circuit that was not behaving according to its datasheet. (In this case a WD1691V support chip in a TRS-80 Model III floppy interface.) Apparently this is not so unheard of." https://retrocomputing.stackexchange.com/questions/13954/what-are-typical-ca...
Looks like ya got yerself an external floppy controller, my friend :)
On Sat, Jul 16, 2022 at 1:41 PM Bob Shuster via vcf-midatlantic < vcf-midatlantic@lists.vcfed.org> wrote:
I found a device among my TRS-80 stuff that I can?t identify. It?s some sort of floppy controller, but in a blank case. It?s got an FD1793B-02 chip socketed in it, and 40-pin and 34-pin card-edge connectors on each end. Solder side of the board has ?8709203 Rev. B? on it, but I can find no reference to this online anywhere.
Anyone have a clue? Photos here: https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp... < https://drive.google.com/drive/folders/1M2AKhMpHAAJ7If6sKEbWejRZ9J_YFsNs?usp...
Thanks. - Bob Shuster
-- Dave Shevett shevett@pobox.com
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Bob Shuster